GSP1954@aol.com wrote:
> Is "Archaeoraptor" from the lower Yixian (=Chaomidianzi) Formation?
>
> Greg Paul
I think it is supposed to be...however, how are we supposed to prove
it??????
maybe if we did some Rare-Earth elemental analyses using a Yixian
Formation standard; other than that we do what we always do: speculate.
Yixian. The basis on which the Chaomidianzi Formation was designated
has no validity according to the International Strat Code. It is hard
to argue a new formation out of the bottom of the Yixian when there is
no lithologic change to support it.
--
Josh Smith
Department of Earth and Environmental Science
University of Pennsylvania
471 Hayden Hall
240 South 33rd Street
Philadelphia, PA 19104-6316
(215) 898-5630 (Office)
(215) 898-0964 (FAX)